I have a humidor that about probably 5yrs ago from Thompson Cigar it is one of the nicer ones it holds approximately 100 cigars I believe I hadn't used it in a long time but recently started getting some good cigars I bought some of the Thompson's crystal clear Tobacco humidifier and a Digital higrometer I put it and a jar of the crystals in it and left them over night the humidity never got above 50% so I added another jar now its at 53% could it be the higrometer is not correct

Anyone that can I would greatly appreciate any advice you can give me on this matter

thanks